Improvement in let-off straps or brakes for looms



G. P; Rosa-A;cA' TWR-IGHT & 'B.,S. ROSE. LET-OFF STRAPS 0R BRAKES FOR LOOMS.v

No.'173,1.37 Patent ed Feb; 8 1376,

ti* *1 Fi .2. v

' N. PETERS. PHOTO LITHOGRAPHFR WASHINGTON, D. O-

UNITED. STATES GEORGE P. Ros AND ABEL OARTWRIGHT, or SLOCUMVILLE, AND BENoNr s; Eos or. LA FAYETTE, RHODE ISLAND.

PATENT IMPROVEMENT IN LET-CFF STRAPS OR BRAKES FOR LOOMS.

Specification forming part of Letters Patent No. 173,] 37, dated February 8, 1876; application filed May 14, 1875. L

To all whom it may concern:

Be it known that we, GEORGE P. Item and ABELOARTWRIGHT, of Slocumville, and BEN- ONI ROSE, of La Fayette, all in the county of Washington and State of Rhode Island, have invented an Improvement in-Friction Straps or Brakes for Let-Off Motion for Looms,

. of which the following is a specification proved friction strapor brake, showing the layers of which it is composed-A, wood B, rubber; 0, iron; and D the lubricating-orifice through them. I

It is well known that leather and iron let off friction straps or brakes used with metallic beam-heads produce electricity by the friction between them; that they gather moisture and gum, causing strong cohesion of the parts; to prevent which we use a strap or brake composed of wood, manila,.hemp, or any other kindred material that is non-conducting'of such matters, for the inner layer, and wrought-iron, steel, or-other suitable material for the outer layer, to give strength and durability to the whole. Vulcanized india-rubber, crimped metal, cork, canvas, or other suitable material, may be used between the, outer and inner layers to form a semi-- elastic cushion, to avoid. rigidity and conform I better to the surfaces of the beam-heads. The

several layers of this let-off friction strap or brake are secured to each other at twoor more points to cause them to operate conjointly.

For the purpose of lubricating this let-0E friction device, and preventing undue wear upon its bearing-surfaces, we make an orifice through the strap or brake, as seen at D,.

throughwhich powered soap-stone, carbu'ret of iron, orblack-lead', 850., may be introduced between the bearing-surfacesof the beamhead and friction strap or brake, and the opening closed by a pivoted cap, as seen in.

the figures.

In practical use this improvement 'may be attached to, and used in,-looms, with any of the well-known let-oil devices, or as more particularly described in our Letters Patent dated March 30, 1875, and No. 161,443.

Its application as a brake for other purposes would be equally advantageous, and the method of adapting it for such purposes :would require only ordinary mechanical skill. Of course the inner strap canbe used, with proper connections at the ends, independent of the other layers, with thefsame general result as to clogging, and may be made of flexible strips of wood bent around, or otherwise, and the orifice through the strap or brake saves the time and trouble of moving itoff and on for lubricating.

Having thus described our improved let-off D friction strap claiml. A three-ply let-ofl' friction strap or brake consisting of an inner flexible layer of wood, or any kindred non-conducting material, and an outer flexible layer of iron, or any material or brake for .looms, &c.,. we

of suitable strength, and an interposed rubber or elastic layer, substantially as and forthe purposes set forth. I

2. A let ofl' friction-strap pro'vided with an orifice and chamber for the introduction of I and carrying'the powdered soap-stone, 850., 

